102BTechnology instructions
9.3 Basic motion control
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
351
Parameter and type
Data type
Description
Mode
IN
Int
Homing mode
0: Direct homing absolute
New axis position is the position value of parameter
"Position".
1: Direct homing relative
New axis position is the current axis po position
value of parameter "Position".
2: Passive homing
Homing according to the axis configuration. Following
homing, the value of parameter "Position" is set as the
new axis position.
3: Active homing
Reference point approach in accordance with the axis
configuration. Following homing, the value of parameter
"Position" is set as the new axis position.
Done
OUT
Bool
TRUE = Task completed
Busy
OUT
Bool
TRUE = The task is being executed.
CommandAborted
OUT
Bool
TRUE = During execution the task was aborted by another
task.
Error
OUT
Bool
TRUE = An error has occurred during execution of the task.
The cause of the error can be found in parameters "ErrorID"
and "ErrorInfo".
ErrorID
OUT
Word
Error ID for parameter "Error""
ErrorInfo
OUT
Word
Error info ID for parameter "ErrorID"
Note
Axis homing is lost under the following conditions
Disabling of axis by the MC_Power instruction
Switchover between automatic control and manual control
Upon start of active homing (After successful completion of the homing operation, axis
homing is available again.)
After power-cycling the CPU
After CPU restart (RUN-to-STOP or STOP-to-RUN)
To home the axis, follow these steps:
1.
Check the requirements indicated above.
2.
Initialize the necessary input parameters with values, and start the homing operation with
a rising edge at input parameter "Execute".
3.
If output parameter "Done" and technology object tag <Axis
name>.StatusBits.HomingDone indicate the value TRUE, homing is complete.